ADC AD-310 Service Manual page 41

d. Troubleshooting Flow Chart - Quick Reference...
Computer/Timer Calls For Heat
I
s spark evident (on)
at Ignitor Assembly?
Yes
Go To Chart 2
Replace the DSI Module.
Energize system and check
for proper operation.
First Visual Check
(Does Ignitor Spark?)
Is 24 Volts
present across DSI Module
No
terminals
TH and COM?
Yes
Check
High Voltage (HV)
Lead for nicks or cracking,
where sparking to ground may
occur. Is this wire
damaged?
No
Visually
inspect Spark
Electrode Assembly. Is
ceramic cracked or Spark
Electrode incorrectly
gapped?
No
Visually
inspect High
Voltage (HV) Wire
connections at both DSI Module
and Ignitor Assembly.
Are connections
secure?
Yes
Remove
High Voltage
(HV) Wire from
DSI Module and visually
Yes
inspect. Is conductor
visible at end of
HV Wire?
No
Yes
Yes
No
No
3 7
Open circuit to DSI System.
Check the 24 VAC power source
.
Sail Switch and Hi-Limit
Repair or replace HV Lead
Assembly.
Energize system and check
for proper operation.
If cracked, replace Electrode
Assembly. Correct gap size
is 1/8" (+/- 1/32").
Energize system and check
for proper operation.
1. At DSI Ignitor Assembly be
sure HV Wire is secure in
the boot as well as the
connection to the Ignitor
Probe Assembly.
2. At DSI Module, center the
end of the HV Wire with a
Spike Terminal. Energize
system and check for
proper operation.
Cut the end off of the HV Wire
1/4" at a time until conductor
becomes visible and is flush
with the insulation.
Reconnect the HV Wire to the
Spike Terminal on the DSI
Module.
Energize system and check
for proper operation.